I bougt these tuners because I could no longer endure the cheap ones delivered with a do it yourself e-guitar Kit. I did not want to spend as much as i.e. those from Schaller cost so I decided to buy these. I really gotta say that they impressed me, especially abfter using those cheap ones.
The tuners are really well made, there's nothing rattly about them and it's very easy to tune exactly. The feel really heavy and solid and I cant imagine any common reason why they would break. But I can't say if they are equal to anything more expensive because I haven't used anything like Schaller, etc.
There is one small drawback but which I am in part responsible for: While installing them somehow some small part of the black coating was scratched of by my wrench. I guess it was my fault but perhaps the coating wasn't quite strong enough there. It's nothing important but it just came to my mind while writing this.